without (so much as) a backward glance

/glɑːns/ n. 一瞥;一滑;闪光

If you leave without a backward glance, you are completely happy to leave and have no sad feelings about it.

连头也不回地(表示非常愿意离开)

He left/ walked away without a backward glance.

他头也不回地扬长而去。

As a consequence, when I came of age I left the city without sparing it a backward glance.

结果就是，当我成年后离开这座城市时，我都不愿回头多看它一眼。